The October issue of RSI MAGAZINE (Roofing, Siding, Insulation) ranked the largest roofing companies in America based on sales volume. Collis was ranked number six in volume, and also in total number of employees. This is a tremendous achivement since Collis only operates in Florida. The ranking proves that operating with integrity and treating people the right way does indeed pay off! Thank you very much Central Florida, we appreciate your business and your trust!